Use OpenArchive, CloseArchive methods and FileName, Active properties of FlexCompress to create, open or close an archive file.
Open archive file before using it. Do not forget to close archive when your application does not needs an access to the archive file. This allows other applications to use the archive file.
You should not update single archive file from multiple applications simultaneously. Use FileAccess.ReadWrite mode and FileShare.None mode to open archive file for updating.
There are some examples of creating, opening and closing archive files:
Look at Archive handling topic to learn how to manage FlexCompress.NET archives.